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any of about 68 species belonging to the vesper bat family (Vespertilionidae). Pipistrelles are found in almost all parts of the world. They are grayish, brown, reddish, or black bats that are about 3.5-10 cm (1.4-4 inches) long, not including the tail, which may be 2.5-6 cm (1-2.4 inches) long.